The patented bronze winding is tightly wrapped around the double end of the string.

Ernie Ball RPS Slinky

Ernie Ball Nickel Wound RPS Slinky strings are made from nickel-plated steel wound around a tin-coated hexagonal steel core. The plain strings feature patented winding using bronze wire around the finishing loop on the end ball, minimizing the risk of slipping or breaking. RPS strings last longer and hold tuning better than traditional strings.